It was a moment of the deepest significance in the history of the world, when the envoys of the Mamertines appeared in the Roman senate. No one indeed could then anticipate all that was to depend on the crossing of that narrow arm of the sea; but that the decision, however it should go, would involve consequences far other and more important than had attached to any decree hitherto passed by the senate, must have been manifest to every one of the deliberating fathers of the city. Strictly upright men might indeed ask how it was possible to deliberate at all, and how any one could even think of suggesting that the Romans should not only break their alliance with Hiero, but should, just after the Campanians of Rhegium had been punished by them with righteous severity, admit the no less guilty Sicilian accomplices to the alliance and friendship of the state, and thereby rescue them from the punishment which they deserved. Such an outrage on propriety would not only afford their adversaries matter for declamation, but must seriously offend all men of moral feeling. But even the statesman, with whom political morality was no mere phrase, might ask in reply, how Roman burgesses, who had broken their military oath and treacherously murdered the allies of Rome, could be placed on a level with foreigners who had committed an outrage on foreigners, where no one had constituted the Romans judges of the one or avengers of the other? Had the question been only whether the Syracusans or Mamertines should rule in Messana, Rome might certainly have acquiesced in the rule of either. Rome was striving for the possession of Italy, as Carthage for that of Sicily; the designs of the two powers scarcely then went further. But that very circumstance formed a reason why each desired to have and retain on its frontier an intermediate power - the Carthaginians for instance reckoning in this way on Tarentum, the Romans on Syracuse and Messana - and why, if that course was impossible, each preferred to see these adjacent places given over to itself rather than to the other great power.

As Carthage had made an attempt in Italy, when Rhegium and Tarentum were about to be occupied by the Romans, to acquire these cities for itself, and had only been prevented from doing so by accident, so in Sicily an opportunity now offered itself for Rome to bring the city of Messana into its symmachy; should the Romans reject it, it was not to be expected that the city would remain independent or would become Syracusan; they would themselves throw it into the arms of the Phoenicians. Were they justified in allowing an opportunity to escape, such as certainly would never recur, of making themselves masters of the natural tete de pont between Italy and Sicily, and of securing it by means of a brave garrison on which they could, for good reasons, rely? Were they justified in abandoning Messana, and thereby surrendering the command of the last free passage between the eastern and western seas, and sacrificing the commercial liberty of Italy? It is true that other objections might be urged to the occupation of Messana besides mere scruples of feeling and of honourable policy. That it could not but lead to a war with Carthage, was the least of these; serious as was such a war, Rome might not fear it. But there was the more important objection that by crossing the sea the Romans would depart from the purely Italian and purely continental policy which they had hitherto pursued; they would abandon the system by which their ancestors had founded the greatness of Rome, to enter upon another system the results of which no one could foretell. It was one of those moments when calculation ceases, and when faith in men's own and in their country's destiny alone gives them courage to grasp the hand which beckons to them out of the darkness of the future, and to follow it no one knows whither. Long and seriously the senate deliberated on the proposal of the consuls to lead the legions to the help of the Mamertines; it came to no decisive resolution. But the burgesses, to whom the matter was referred, were animated by a lively sense of the greatness of the power which their own energy had established. The conquest of Italy encouraged the Romans, as that of Greece encouraged the Macedonians and that of Silesia the Prussians, to enter upon a new political career. A formal pretext for supporting the Mamertines was found in the protectorate which Rome claimed the right to exercise over all Italians. The transmarine Italians were received into the Italian confederacy[3]; and on the proposal of the consuls the citizens resolved to send them aid (489).

War between the Romans and the Carthaginians and the Syracusans Much depended on the way in which the two Sicilian powers, immediately affected by this intervention of the Romans in the affairs of the island, and both hitherto nominally in alliance with Rome, would regard her interference. Hiero had sufficient reason to treat the summons, by which the Romans required him to desist from hostilities against their new confederates in Messana, precisely in the same way as the Samnites and Lucanians in similar circumstances had received the occupation of Capua and Thurii, and to answer the Romans by a declaration of war. If, however, he remained unsupported, such a war would be folly; and it might be expected from his prudent and moderate policy that he would acquiesce in what was inevitable, if Carthage should be disposed for peace. This seemed not impossible. A Roman embassy was now (489) sent to Carthage, seven years after the attempt of the Phoenician fleet to gain possession of Tarentum, to demand explanations as to these incidents[4]. Grievances not unfounded, but half-forgotten, once more emerged - it seemed not superfluous amidst other warlike preparations to replenish the diplomatic armoury with reasons for war, and for the coming manifesto to reserve to themselves, as was the custom of the Romans, the character of the party aggrieved. This much at least might with entire justice be affirmed, that the respective enterprises on Tarentum and Messana stood upon exactly the same footing in point of design and of pretext, and that it was simply the accident of success that made the difference. Carthage avoided an open rupture. The ambassadors carried back to Rome the disavowal of the Carthaginian admiral who had made the attempt on Tarentum, along with the requisite false oaths: the counter-complaints, which of course were not wanting on the part of Carthage, were studiously moderate, and abstained from characterizing the meditated invasion of Sicily as a ground for war. Such, however, it was; for Carthage regarded the affairs of Sicily - just as Rome regarded those of Italy - as internal matters in which an independent power could allow no interference, and was determined to act accordingly. But Phoenician policy followed a gentler course than that of threatening open war. When the preparations of Rome for sending help to the Mamertines were at length so far advanced that the fleet formed of the war-vessels of Naples, Tarentum, Velia, and Locri, and the vanguard of the Roman land army under the military tribune Gaius Claudius, had appeared at Rhegium (in the spring of 490), unexpected news arrived from Messana that the Carthaginians, having come to an understanding with the anti-Roman party there, had as a neutral power arranged a peace between Hiero and the Mamertines; that the siege had in consequence been raised; and that a Carthaginian fleet lay in the harbour of Messana, and a Carthaginian garrison in the citadel, both under the command of admiral Hanno. The Mamertine citizens, now controlled by Carthaginian influence, informed the Roman commanders, with due thanks to the federal help so speedily accorded to them, that they were glad that they no longer needed it.